honda self propelled mower problems?

my mower has stopped driving, i hit a large obstacle with it, the drive belt come off ... i put it back on and the drive lever doesnt seem to be engaging properly and the rear wheels jam when its being pulled backwards. one of the rear wheels( i presume the drive wheel) sounds like it has a badly worn bearing when i spin it by hand. any advice on what to look for would be greatly recieved
thanks